Copious numbers of artifacts and books to be put on display and preserved for future generations are kept at museums and archives. Of course, this makes stringent demands of a well-controlled indoor climate.

The indoor climate in museums and archives should be kept constant and consistent. Large variations in temperature and ambient humidity can cause condensation or cracks in old books, for example. Organic materials contain microorganisms that can be brought to life by moisture and heat. Dehumidification is also used for the preservation of microfilm in order to protect the delicate films.